Patna airport today witnessed one of the rare instances of factionalism within the BJP as supporters Union minister Ravi Shankar Prasad and party colleague RK Sinha came to blows. Mr Sinha, 67, the owner of a prominent security agency, is a contender for the Patna Sahib constituency, from where the 64-year-old minister has been nominated. The sitting member of Patna Sahib, BJP's Shatrughan Sinha, has been dropped by the party, which had been at the receiving end of his barbs for long.